open-im-server/config/email.tmpl

{{ define "email.to.html" }}
{{ range .Alerts }}
<!-- Begin of OpenIM Alert -->
<div style="border:1px solid #ccc; padding:10px; margin-bottom:10px;">
    <h3>OpenIM Alert</h3>
    <p><strong>Alert Program:</strong> Prometheus Alert</p>
    <p><strong>Severity Level:</strong> {{ .Labels.severity }}</p>
    <p><strong>Alert Type:</strong> {{ .Labels.alertname }}</p>
    <p><strong>Affected Host:</strong> {{ .Labels.instance }}</p>
    <p><strong>Affected Service:</strong> {{ .Labels.job }}</p>
    <p><strong>Alert Subject:</strong> {{ .Annotations.summary }}</p>
    <p><strong>Trigger Time:</strong> {{ .StartsAt.Format "2006-01-02 15:04:05" }}</p>
</div>
<!-- End of OpenIM Alert -->
{{ end }}
{{ end }}